Question about Briggs & Stratton Power Products 5,550 Watt Portable Generator #30241

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Black max 7kw generator high voltage output

Black max 7kw generator with 13 hp honda engine. While running in snow storm last winter quit producing voltage. Dried out and seemed to run ok and posered lights fine but i did not check voltage. Tried to run this week. Checked voltage and reads 145vac and 290vac. Hz is 62. opened the cover and conections looked good and clean, AVR looks to be hermetically sealed.

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  • wlbaumann May 10, 2010

    I appreciate the tips and the help. Used both a True RMS volt meter and a simple meter. Results were less than a half a volt difference. A 60 watt bulb burned significantly brighter on gen power than on the utility. I adjusted freq exactly to 60Hz with no real change in output voltage. I must believe the voltage is high on the generator by a significant amount. I do not have a print of the circuit to aid troubleshooting. The generator does have a AVR. I am considering changing that as a start.

  • wlbaumann Jun 10, 2010

    Replaced AVR. everything is working well now. Had to wait a long time to get one
    Advice from this site was a real help.

  • Anonymous Mar 16, 2014

    machine runs rough and will not come up to speed



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Those voltage readings MAY be normal.

The AC waveform may cause your meter to read inaccurately. You would need to use a TRUE RMS meter to accurately read the voltage.

The siple meters actually read the AVERAGE voltage and then are calibrated to mulltiply it by the "form factor" for a sine wave. OFTEN these generators don't produce a clean sine wave. A square-ish wave will read higher on the garden variety meters.

Compare the brightness of a lamp comparing to when run on your utility.

The frequency depends on engine speed ... yours is running a bit fast...check it under at least half load and if off, adjust the govenor slightly.

Posted on May 02, 2010

Testimonial: "Still working on the problem but tips were a real help."

  • Fred Yearian May 10, 2010

    That means that the waveform is good with both meters reading the same.

    Yes, the AVR must have a problem with its reference. Not sure if the components are accessable for replacement. I suspect that the driver transistor for the field MAY have shorted if this is a brush type unit putting full voltage on the field. If you can access the parts (if they are not "potted") it should be easy to find the bad component. The circuit will be rather simple so you might have to trace it out. A shorted driver will be found with an ohmmeter quickly. There probably would be a transistor driving the main one and that might be bad, however, the main driver would be the likely culprit because it is closest to where it can be damaged via transients.

    Finding a new AVR unit might be a hassle.

    The brushless types use a capacitor and the caps are usually pretty stable..

  • Fred Yearian Jun 10, 2010

    Glad it is working. You might think back if you did something to cause the failure like a sudden overload so as to avoid a repeat.

    Likely there is a semiconductor driving the field from rectified DC and that semiconductor probably shorted putting full voltage on the field. If you can open the AVR, it would be good to perform a post mortem on it.



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